Gotta agree with Donny on this one - the song is a great oldie that I perform once in a while, but there are very easy ways to access the voice changes without adding another keyboard.
Jim, I assume that you are synching the video with the keyboard's onboard recorder, which seems to be the way to go - flawless vids.
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)